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My insignia model nm55423 turns on then soon the audio stops

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my insignia model nm55423 turns on then soon the audio stops then the video stopsJA: How old is your NM55423?Customer: 3 or 4 yearsJA: Does the TV menu work? Do you have the same problem on all sources/inputs?Customer: yesJA: How long has this been an issue with your NM55423? What happened right before this?Customer: a weekJA: Anything else you want the TV Expert to know before I connect you?Customer: no